Not to be confused with the shape of a diamond, cut refers to a diamond’s facets, proportions, symmetry and polish. These things determine the depth of brilliance and sparkle a diamond has. When properly cut, a diamond will refract the most amount of light possible, creating the internal fire and shine that distinguish a diamond’s beauty. For example, a round brilliant diamond is composed of a top crown and bottom pavilion. The proportional relationship (width versus depth) between these two components will ultimately determine how well light reflects and refracts within the diamond.